Recovery method of compact disc

ABSTRACT

A recovery method of a compact disc includes the steps of: crushing a compact disc; b) placing the crushed compact disc into a stripping solution, so that the metallic layer is separated from the plastic base plates of the crushed compact disc; c) filtering the plastic base plates from the stripping solution; d) recovering the metal; and e) recovering the plastic base plates. Thus, the waste compact disc may be recovered and reused, thereby preventing incurring an environmental pollution.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a recovery method of a compactdisc, and more particularly to a recovery method of a compact disc,which may be performed in an environmental protection manner.

[0003] 2. Description of the Related Art

[0004] A compact disc comprises a circular base plate made of plasticmaterial, and a metal layer plated on one side of the base plate. Whenthe compact disc is worn out, it is directly thrown away. However, ifthe compact disc is directly thrown away, the metal contained in thecompact disc will easily cause an environmental pollution. In addition,the metal and the plastic base plate may be recovered and reused. Thus,waste of the compact disc will cause consumption of the resource.

SUMMARY OF THE INVENTION

[0005] The primary objective of the present invention is to provide arecovery method of a compact disc, wherein the waste compact disc may berecovered and reused, thereby preventing causing an environmentalpollution.

[0006] In accordance with the present invention, there is provided arecovery method of a compact disc, comprising the steps of:

[0007] a) crushing a compact disc into multiple pieces;

[0008] b) placing the multiple pieces of the crushed compact disc into astripping solution, thereby stripping the multiple pieces of the crushedcompact disc, so that a metallic layer of the crushed compact disc isseparated from plastic base plates of the crushed compact disc;

[0009] c) filtering the plastic base plates and the stripping solution,thereby separating the plastic base plates from the stripping solutioncontaining the metal;

[0010] d) recovering the metal:

[0011] (1) passing the stripping solution containing the metal throughan absorbing agent, to perform an ion exchanging reaction, so that themetal is attached to a surface of the resin;

[0012] (2) adding a reproducing agent into the stripping solution, sothat the metal is detached from the absorbing agent, thereby reproducingthe absorbing agent, so that the absorbing agent may be recovered andreused;

[0013] (3) placing the stripping solution into a plating bath, toperform a plating process, so that the metal is attached to a negativeelectrode of the plating bath to be recovered; and

[0014] e) recovering the plastic base plates.

[0015] At the sub-step (1) of the step (d), the absorbing agent mayfunction as a filter, whereby clean water may be separated from thestripping solution, so that the clean water may be recovered and reused.

[0016] At the sub-step (3) of the step (d), the stripping solution maybe recovered and reused.

[0017] The step (d) further includes the steps of:

[0018] (4) collecting and melting the metal attached to the negativeelectrode of the plating bath into a melted metal;

[0019] (5) forming the melted metal into an ingot; and

[0020] (6) forming the ingot into a metal block.

[0021] The step (e) further includes the steps of:

[0022] (1) cleaning the plastic base plates that have been carried awayfrom the stripping solution by clean water;

[0023] (2) drying the plastic base plates that have been cleaned;

[0024] (3) twisting the plastic base plates that have been dried intomultiple particles, thereby forming the particle-shaped plasticmaterial.

[0025] After the sub-step (1) of the step (e), during a rinsing processof the plastic base plates, a residue metal on surfaces of the plasticbase plates is dissolved into a water solution, and the water solutioncontaining the residue metal is then poured into the absorbing agent.

[0026] Further benefits and advantages of the present invention willbecome apparent after a careful reading of the detailed description withappropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027]FIG. 1 is a flow chart of a recovery method of a compact disc inaccordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0028] Referring to FIG. 1, a recovery method of a compact disc inaccordance with the present invention may be used to recover a wastecompact disc (C.D.) and comprises the following steps.

[0029] First of all, the waste compact disc (as indicated by numeral 10)may be placed into a crushing machine so that the compact disc may becrushed (as indicated by numeral 12) into multiple pieces.

[0030] Then, the multiple pieces of the crushed compact disc may beplaced into a stripping solution (as indicated by numeral 14) that ismixed by cyanogen, catalyst, and water, thereby stripping the multiplepieces of the crushed compact disc, so that the metallic layer isseparated from the plastic base plates of the crushed compact disc.Thus, the metal of the crushed compact disc is dissolved in thestripping solution, and the plastic base plates of the crushed compactdisc float on the upper portion of the crushing machine due to itssmaller density.

[0031] Then, the plastic base plates and the stripping solution arefiltered (as indicated by numeral 16) by a filtering net, therebyseparating the plastic base plates from the stripping solutioncontaining the metal. Thus, the metal solution (as indicated by numeral18) and the plastic base plates (as indicated by numeral 20) may befurther processed by steps which will be further described in detaillater.

[0032] Then, the plastic base plates separated form the metal arecarried away. The stripping solution containing the metal then passesthrough an absorbing agent (as indicated by numeral 22) made of resin,to perform an ion exchanging reaction, so that the metal is attached tothe surface of the resin.

[0033] At the same time, the absorbing agent made of resin may functionas a filter, so that clean water may be separated from the strippingsolution. Thus, the clean water may be recovered and reused (asindicated by numeral 24).

[0034] Then, a reproducing agent of a negative ion may be added (asindicated by numeral 26) into the stripping solution containing theabsorbing agent made of resin, so that the metal is detached from theabsorbing agent made of resin, thereby reproducing the absorbing agentmade of resin (as indicated by numeral 28), so that the absorbing agentmade of resin may be recovered and reused (as indicated by numeral 30).

[0035] Then, the stripping solution containing the metal that isdetached from the absorbing agent made of resin may be placed into aplating bath, to perform a plating process (as indicated by numeral 32),so that the metal is attached to the negative electrode of the platingbath. At the same time, the stripping solution may be recovered andreused (as indicated by numeral 34).

[0036] Then, the metal attached to the negative electrode of the platingbath may be collected and melted into a melted metal (as indicated bynumeral 36).

[0037] Then, the melted metal may be formed into an ingot (as indicatedby numeral 38).

[0038] Then, the ingot is formed into a metal block (as indicated bynumeral 40).

[0039] Then, the plastic base plates that have been carried away fromthe stripping solution may be cleaned (as indicated by numeral 42) bythe clean water.

[0040] At the same time, during the rinsing process of the plastic baseplates, the residue metal on the surfaces of the plastic base plateswill be dissolved into the water solution. Then, the water solutioncontaining the residue metal (as indicated by numeral 44) may be pouredinto the absorbing agent made of resin (as indicated by numeral 22), soas to perform the ion exchanging reaction, so that the metal is attachedto the surface of the resin. The metal then be further processed in thesimilar manner as described above.

[0041] Then, the plastic base plates that have been cleaned may be dried(as indicated by numeral 48).

[0042] Then, the plastic base plates that have been dried may be twistedinto multiple particles (as indicated by numeral 50), thereby formingthe particle-shaped plastic material.

[0043] Accordingly, the recovery method of a compact disc in accordancewith the present invention has the following advantages.

[0044] The absorbing agent, the stripping solution, and the clean watermay be recovered and reused cyclically, thereby preventing consumptionof the resource, preventing causing environmental pollution, and greatlydecreasing the cost of fabrication.

[0045] The metal and the plastic base plates may be recovered andreused, so that the metal is not wasted directly, thereby satisfying therequirements of the environmental protection, and thereby satisfying therequirements of the recovery of the resource.

[0046] Although the invention has been explained in relation to itspreferred embodiment as mentioned above, it is to be understood thatmany other possible modifications and variations can be made withoutdeparting from the scope of the present invention. It is, therefore,contemplated that the appended claim or claims will cover suchmodifications and variations that fall within the true scope of theinvention.

What is claimed is:
 1. A recovery method of a compact disc, comprisingthe steps of: a) crushing a compact disc into multiple pieces; b)placing said multiple pieces of said crushed compact disc into astripping solution, thereby stripping said multiple pieces of saidcrushed compact disc, so that a metallic layer of said crushed compactdisc is separated from plastic base plates of said crushed compact disc;c) filtering said plastic base plates and said stripping solution,thereby separating said plastic base plates from said stripping solutioncontaining said metal; d) recovering said metal: (1) passing saidstripping solution containing said metal through an absorbing agent, toperform an ion exchanging reaction, so that said metal is attached to asurface of said resin; (2) adding a reproducing agent into saidstripping solution, so that said metal is detached from said absorbingagent, thereby reproducing said absorbing agent, so that said absorbingagent may be recovered and reused; (3) placing said stripping solutioninto a plating bath, to perform a plating process, so that said metal isattached to a negative electrode of said plating bath to be recovered;and e) recovering said plastic base plates.
 2. The recovery method of acompact disc in accordance with claim 1, wherein said stripping solutionis mixed by cyanogen, catalyst, and water.
 3. The recovery method of acompact disc in accordance with claim 1, wherein said absorbing agent ismade of resin.
 4. The recovery method of a compact disc in accordancewith claim 1, wherein at said sub-step (1) of said step (d), saidabsorbing agent may function as a filter, whereby clean water may beseparated from said stripping solution, so that said clean water may berecovered and reused.
 5. The recovery method of a compact disc inaccordance with claim 1, wherein said reproducing agent is formed by anegative ion.
 6. The recovery method of a compact disc in accordancewith claim 1, wherein at said sub-step (3) of said step (d), saidstripping solution may be recovered and reused.
 7. The recovery methodof a compact disc in accordance with claim 1, wherein said step (d)further includes the steps of: (4) collecting and melting said metalattached to said negative electrode of said plating bath into a meltedmetal; (5) forming said melted metal into an ingot; and (6) forming saidingot into a metal block.
 8. The recovery method of a compact disc inaccordance with claim 1, wherein said step (e) further includes thesteps of: (1) cleaning said plastic base plates that have been carriedaway from said stripping solution by clean water; (2) drying saidplastic base plates that have been cleaned; (3) twisting said plasticbase plates that have been dried into multiple particles, therebyforming said particle-shaped plastic material.
 9. The recovery method ofa compact disc in accordance with claim 1, wherein after said sub-step(1) of said step (e), during a rinsing process of said plastic baseplates, a residue metal on surfaces of said plastic base plates isdissolved into a water solution, and said water solution containing saidresidue metal is then poured into said absorbing agent.